This particular rock, positioned just a few metres northeast and slightly uphill from another marked stone known as DON 33, bears two distinctive cupmarks; shallow, circular depressions deliberately carved into its surface thousands of years ago. First documented by researcher Van Hoek in 1987, these simple yet intriguing markings form part of a wider landscape of ancient rock art scattered across this corner of northwest Ireland.

Cupmarks, or cup and ring marks as they're sometimes known when accompanied by concentric circles, represent one of the most common forms of prehistoric rock art found throughout Ireland and Britain. Dating primarily from the Neolithic and Bronze Age periods, roughly 4000 to 1500 BCE, these enigmatic symbols have puzzled archaeologists for generations. While their exact purpose remains uncertain, theories range from territorial markers and astronomical calendars to ritual or ceremonial significance, possibly related to water, fertility, or communication with ancestral spirits.

The Magheranaul examples, compiled and catalogued by Caimin O'Brien in 2010, contribute to Donegal's rich archaeological heritage. The county boasts numerous rock art sites, particularly in areas like Kilclooney and the Inishowen Peninsula, where ancient communities left their mark on the landscape. These seemingly simple cupmarks connect modern visitors to a time when the hills of Donegal were home to early farming communities who felt compelled to carve permanent symbols into the bedrock, leaving behind a mysterious legacy that continues to inspire curiosity and speculation today.